Replace WTF::emptyString{16Bit}() with a static global

third_party/WebKit/Source/core/loader/FormSubmission.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 111 matching lines @@
 String FormSubmission::Attributes::methodString(SubmitMethod method) {
   switch (method) {
     case GetMethod:
       return "get";
     case PostMethod:
       return "post";
     case DialogMethod:
       return "dialog";
   }
   NOTREACHED();
-  return emptyString();
+  return emptyString;
 }
 
 void FormSubmission::Attributes::copyFrom(const Attributes& other) {
   m_method = other.m_method;
   m_isMultiPartForm = other.m_isMultiPartForm;
 
   m_action = other.m_action;
   m_target = other.m_target;
   m_encodingType = other.m_encodingType;
   m_acceptCharset = other.m_acceptCharset;
@@ skipping 163 matching lines @@
 
   frameRequest.resourceRequest().setURL(requestURL());
 
   frameRequest.setTriggeringEvent(m_event);
   frameRequest.setForm(m_form);
 
   return frameRequest;
 }
 
 }  // namespace blink